Datasheet MAX4400, MAX4401, MAX4402, MAX4403 (Maxim) - 10

MAX4400–MAX4403 Single/Dual/Quad, Low-Cost, Single-Supply, Rail-to-Rail Op Amps with Shutdown
Pin Description PIN NAME FUNCTION MAX4400 MAX4401 MAX4402 MAX4403
1 1 — — IN+ Noninverting Amplifier Input — — 3 3 INA+ Noninverting Amplifier Input A — — 5 5 INB+ Noninverting Amplifier Input B — — — 10 INC+ Noninverting Amplifier Input C — — — 12 IND+ Noninverting Amplifier Input D 2 2 4 11 V Negative Supply. Connect to ground for single- supply SS operation. 3 3 — — IN- Inverting Amplifier Input — — 2 2 INA- Inverting Amplifier Input A — — 6 6 INB- Inverting Amplifier Input B — — — 9 INC- Inverting Amplifier Input C — — — 13 IND- Inverting Amplifier Input D 4 4 — — OUT Amplifier Output — — 1 1 OUTA Amplifier Output A — — 7 7 OUTB Amplifier Output B — — — 8 OUTC Amplifier Output C — — — 14 OUTD Amplifier Output D 5 6 8 4 VDD Positive Supply — 5 — — SHDN Active-Low Shutdown Input. Connect to VDD for normal operation. Do not leave unconnected.
Detailed Description Rail-to-Rail Output Stage
The MAX4400–MAX4403 can drive a 2kΩ load and still typically swing within 55mV of the supply rails. Figure 1 shows the output voltage swing of the MAX4400 config- ured with A 1V/div V = +10V/V.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The MAX4400–MAX4403 are unity-gain stable for a range 100µs/div of capacitive loads to above 400pF. Figure 2 shows the response of the MAX4400 with an excessive capacitive Figure 1. Rail-to-Rail Output Operation load. Adding a series resistor between the output and the load capacitor (Figure 3) improves the circuit’s response by isolating the load capacitance from the op amp’s output. www.maximintegrated.com Maxim Integrated │ 10